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The SAFFE score is the average of item responses, with higher scores indicating greater fear of falling and has high internal consistency (intra-class correlation coefficient: 0.91) [ 75].
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Design: Calibration of item responses by using a data set.
The item response model used in (1) does not require the same complete list of item responses for all respondents.
Item randomization avoids framing of item responses by precedent items.
In terms of the fit of item responses to the Rasch model, responses to anatomy items were mildly skew towards overfitting the model according to 'infit' (information weighted) indices: the average z score for infit for anatomy items was -.20 reflecting a tendency to less variation in responses than the Rasch model would have predicted.
Table 1 Average Type I error for generalized residuals of item response functions Assessment Average type I error 11 points 31 points LTT math age 9 12 10 Reading grade 12 10 9 Math grade 8 9 8 Science grade 12 12 12.
Binary item disengagement indicators were created by means of item response time thresholds.
Scale scores are the average of the component item responses, transformed linearly to a range of 0 100 (as described in the User's Guide).
Their normative threshold method defines a certain percentage (e.g., 10%) of the average item response time as the threshold and assumes a maximum threshold value of, for instance, 10 s. Lee and Jia (2014) applied another method, previously considered by Ma et al. (2011), to multiple-choice (MC) items.
On average 1.3% of the item responses were missing; 79% of patients did not have any missing items.
Scores for each of the factors are derived by averaging the component item responses [14].
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